Research on braking energy recovery strategy of electric vehicle based on ECE regulation and I curve

Abstract

Electric vehicles can convert the kinetic energy of the vehicle into electric energy for recycling. A reasonable braking force distribution strategy is the key to ensure braking stability and the energy recovery rate. For an electric vehicle, based on the ECE regulation curve and ideal braking force distribution (I curve), the braking force distribution strategy of the front and rear axles is designed to study the braking energy recovery control strategy. The fuzzy control method is adopted while the charging power limit of the battery is considered to correct the regenerative braking torque of the motor, the ratio of the regenerative braking force of the motor to the front axle braking force is designed according to different braking strengths, then the braking force distribution and braking energy recovery control strategies for regenerative braking and friction braking are developed. The simulation model of combined vehicle and energy recovery control strategy is established by Simulink and Cruise software. The braking energy recovery control strategy of this article is verified under different braking conditions and New European Driving Cycle conditions. The results show that the control strategy proposed in this article meets the requirements of braking stability. Under the condition of initial state of charge of 75%, the variation of state of charge of braking control strategy in this article is reduced by 8.22%, and the state of charge of braking strategy based on I curve reduces by 9.12%. The braking force distribution curves of the front and rear axle are in line with the braking characteristics, can effectively recover the braking energy, and improve the battery state of charge. Taking the using range of 95%–5% of battery state of charge as calculation target, the cruising range of vehicle with braking control strategy of this article increases to 136.64 km, which showed that the braking control strategy in this article could increase the cruising range of the electric vehicle.

Simulation Research on Regenerative Braking Control Strategy of Hybrid Electric Vehicle

“…According to the distribution range restricted by ECE-R13 braking regulations, the ideal braking distribution I curve and F group line [14], combined with the advantages of a traditional ideal braking distribution method, parallel braking force distribution method and maximum energy recovery distribution method, a braking force distribution control strategy for front and rear axles based on braking strength is proposed.…”

Regenerative Braking Control Strategy for Electric Vehicles Based on Optimization of Switched Reluctance Generator Drive System

“…When it comes to the design of braking system for EVs, the braking energy recovery should be highly considered. Therefore, the braking force distribution curve should be designed between the I-curve and ECE regulation curve [31], [32]. In this paper, a partition braking force distribution strategy is designed and applied according to braking intensity [33], where five regions are divided as shown in Fig.…”

Research on Control Strategy of Hydraulic Regenerative Braking of Electrohydraulic Hybrid Electric Vehicles

“…Li et al [13] proposed an adaptive online prediction method with a variable prediction range. Li et al [14] applied a fuzzy control method to design a braking control strategy and verified the effectiveness of the strategy through simulation. Ko et al [15] proposed an effective regenerative braking coordinated control algorithm to improve the energy recovery rate when the wheels are unlocked.…”